. >>> vice president joe biden was in beijing today meeting with china's new president amid a ratcheting up of tensions in the region that has seen not only the usual inflammatory words but even the deployment of u.s. warplanes. chief washington correspondent james rosen brings us that story. >> reporter: in five and a half hours of talks that u.s. officials said were marked by casual candor, the chinese president said their two countries must build a new model for relations in order to deal with a world that is not tranquil. >> regional hot spot issues keep popping up and there are more pronounced challenges such as climate change. >> reporter: among those hot spot issues is china's declaration last month that it controls the airspace over a huge swath of the east china sea. the u.s. promptly flew b-52 bombers in the zone, but regional allies taiwan, japan, south korea remain on edge as a territorial dispute has escalated sky high. white house officials said biden reaffirmed that the u.s. does not recognize the air defense zone. >> the new model of great power relationship envisioned in